Gapless dual-comb spectroscopy in terahertz region
Abstract
We demonstrated combination of gapless terahertz (THz) comb with dual-comb spectroscopy, namely gapless dual-THz-comb spectroscopy, to achieve the spectral resolution equal to width of the THz comb tooth. The gapless THz comb was realized by interpolating frequency gaps between the comb teeth with sweeping of a laser mode-locked frequency. The demonstration of low-pressure gas spectroscopy with gapless dual-THz-comb spectroscopy clearly indicated that the spectral resolution was decreased down to 2.5-MHz width of the comb tooth and the spectral accuracy was enhanced to 10-6 within the spectral range of 1THz. The proposed method will be a powerful tool to simultaneously achieve high resolution, high accuracy, and broad spectral coverage in THz spectroscopy.
Cite
@article{arxiv.1303.5799,
title = {Gapless dual-comb spectroscopy in terahertz region},
author = {Takeshi Yasui and Yi-Da Hsieh and Yuki Iyonaga and Yoshiyuki Sakaguchi and Shuko Yokoyama and Hajime Inaba and Kaoru Minoshima and Francis Hindle and Tsutomu Araki},
journal= {arXiv preprint arXiv:1303.5799},
year = {2014}
}
Comments
12 pages, 4 figures